Removal of the Support with the Pylon Fire Detectors

TASK 26-12-16-000-002-A
Removal of the Support with the Pylon Fire Detectors

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

FIN: 3WD1 ** ON A/C NOT FOR ALL
FIN: 3WD2 ** ON A/C NOT FOR ALL
FIN: 4WD1 ** ON A/C NOT FOR ALL
FIN: 4WD2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 36-11-49-000-007-A	Removal of the Duct Assy
TASK 36-11-49-000-010-B	Removal of the Upper Bleed-Air Duct
TASK 36-11-49-000-040-A	Removal of the Pylon Interface Duct
TASK 36-11-49-000-042-A	Removal of the Pylon Interface Duct
TASK 36-11-49-000-049-A	Removal of the Duct Assy
TASK 36-11-53-000-001-A	Removal of the Overpressure Valve
TASK 36-11-54-000-001-A	Removal of the Fan Air Valve
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
Pylon Fire Detectors - Support ** ON A/C NOT FOR ALL
Pylon Fire Detectors - Support ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-12-16-861-050-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-16-941-051-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 26-12-16-865-053-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-16-010-054-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-052-A ** ON A/C NOT FOR ALL

E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-12-16-010-055-A ** ON A/C NOT FOR ALL

F. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-16-020-055-B ** ON A/C NOT FOR ALL

G. Get Access to the Support Assembly
(1) Remove the Fan Air Valve (FAV) (Ref. AMM TASK 36-11-54-000-001).
(2) Remove the pylon interface duct (Ref. AMM TASK 36-11-49-000-040).
(3) Remove the duct assy (Ref. AMM TASK 36-11-49-000-007).

Subtask 26-12-16-010-054-B ** ON A/C NOT FOR ALL

H. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-052-C ** ON A/C NOT FOR ALL

I. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-12-16-010-055-C ** ON A/C NOT FOR ALL

J. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-16-020-055-A ** ON A/C NOT FOR ALL

K. Get Access to the Support Assembly
(1) Remove the Fan Air Valve (FAV) (Ref. AMM TASK 36-11-54-000-001).
(2) Remove the pylon interface duct (Ref. AMM TASK 36-11-49-000-042).
(3) Remove the duct assy (Ref. AMM TASK 36-11-49-000-049).

Subtask 26-12-16-010-054-D ** ON A/C NOT FOR ALL

L. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-052-B ** ON A/C NOT FOR ALL

M. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 26-12-16-010-055-B ** ON A/C NOT FOR ALL

N. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 26-12-16-020-055-C ** ON A/C NOT FOR ALL

O. Get Access to the Support Assembly
(1) If necessary, remove the following equipment:
(a) Remove the Fan Air Valve (FAV) (Ref. AMM TASK 36-11-54-000-001).
(b) Remove the upper bleed air duct (Ref. AMM TASK 36-11-49-000-010).
(c) Remove the duct and the duct assy (Ref. AMM TASK 36-11-53-000-001).

4. Procedure
Subtask 26-12-16-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Support Assembly

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(1) Disconnect the electrical connectors of the fire detectors (5) and (6).
(2) Put a CAP - BLANKING on the electrical connectors.
(3) Loosen and remove the bolt (9) and the washer (8).
(4) Loosen and remove the bolts (2) and nuts (3).
(5) Disconnect the tubular support (7).
(6) Remove the tubular support (4).
(7) Remove the support assembly (1).

Subtask 26-12-16-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Support Assembly
(1) Disconnect the connectors of the fire detectors and put CAP - BLANKING on the electrical connectors.
(2) Remove the nuts (1), bolts (2), washers (6) and the clamps (3).
(3) Loosen and remove the bolts (5) and nuts (4) from the support.
(4) Remove the support assembly (7).

[Rev.10 from 2021] 2026.03.31 23:42:46 UTC